I planned to purchase Canons 100-400 f4.5-5.6L IS USM but now I found out about a stabilized lense by Sigma :80-400mm OS f4.5-5.6EX HSM.
Sounds very much the same but a few hundred bucks cheaper.
(Best price I found in Germany: 1170Euros)
Does anyone use that very lens or has a link to a review?
Thanks for your help